Collection AngularJS + Spring 数据 JPA @OneToMany @ManyToOne 中的空值

Question

我有双向关系。这是我的 entity factura:

@Entity
@Table(name = "T_FACTURA")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Factura implements Serializable {
   ...
    @OneToMany(mappedBy = "factura")
    @JsonIgnore
    @Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
    private Set<Facturaservicio> facturaservicios = new HashSet<>();
    ...
    @Override
    public String toString() {
        //all attributes except facturaservicios
    }
}

这是我的 实体 facturaservicio:

@Entity
@Table(name = "T_FACTURASERVICIO")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Facturaservicio implements Serializable {
    ...
    @ManyToOne
    private Factura factura;
    ...
    @Override
    public String toString() {
        //all attributes except factura
    }
}

这是我的 REST 控制器

@RestController
@RequestMapping("/app")
public class FacturaResource {

    private final Logger log = LoggerFactory.getLogger(FacturaResource.class);

    @Inject
    private FacturaRepository facturaRepository;

    @RequestMapping(value = "/rest/facturas",
            method = RequestMethod.GET,
            produces = MediaType.APPLICATION_JSON_VALUE)
    @Timed
    public List<Factura> getAll() {
        log.debug("REST request to get all Facturas");
        return facturaRepository.findAll();
    }

这是我的 AngularJS 控制器:

 $http.get('app/rest/facturas').
                        success(function (data, status, headers, config) {
                            console.log(JSON.stringify(data));
});

为什么我的 collection 在 AngularJS 控制器中为空？如何访问 collection?

Answer 1

在 Factura 实体中，您需要删除以下代码段中的 @JsonIgnore 属性：

@OneToMany(mappedBy = "factura")
@JsonIgnore
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<Facturaservicio> facturaservicios = new HashSet<>();

Answer 2

当 JHipster 创建具有 OneToMany - ManyToOne 关系的实体时，第一个实体 (factura) 具有第二个实体 (facturaservicios) 的列表，但它没有说明关系的类型。

所以解决方案是在@OneToManyRelation中添加fetch = FetchType.EAGER。

@OneToMany(mappedBy = "factura", fetch = FetchType.EAGER)
@JsonIgnore
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<Facturaservicio> facturaservicios = new HashSet<>();

@ManyToOne
private Factura factura;

Collection AngularJS + Spring 数据 JPA @OneToMany @ManyToOne 中的空值

Collection null in AngularJS + Spring Data JPA @OneToMany @ManyToOne

spring

jpa

angularjs

jhipster